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WHITESTEIN Technologies JADE Web Service Integration Gateway (WSIG) Dominic Greenwood JADE Tutorial, AAMAS 2005
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Page 1: JADE Tutorial WSIG Slides

WHITESTEINTechnologies

JADE Web Service Integration Gateway (WSIG)

Dominic Greenwood

JADE Tutorial, AAMAS 2005

Page 2: JADE Tutorial WSIG Slides

Dominic Greenwood –2–Copyright © 2005 by Whitestein Technologies AG, SwitzerlandAll rights reserved.

• i.e. Web services

The W3C definition of a Web service as “a software system designed to supportinteroperable machine-to-machine interaction over a network. It has an interface describedin a machine-processable format (specifically WSDL). Other systems interact with the Webservice in a manner prescribed by its description using SOAP messages, typically conveyedusing HTTP with an XML serialization in conjunction with other Web related standards”

•Trend likely to substantiated by Semantic Web technologies (e.g. OWL and OWL-S)

WS are exerting increasing influence across commerce and industry

•Business Rules & Business Process Management (e.g., WSBPEL)

Approaching a point of critical inertia to becoming a mainstream technology

Introduction

Web Services

WWW has increasing movement towards machine-to-machine models of interaction

Page 3: JADE Tutorial WSIG Slides

Dominic Greenwood –3–Copyright © 2005 by Whitestein Technologies AG, SwitzerlandAll rights reserved.

Introduction (cont.)

Web services and Agents

There are clear benefits in connecting agents and Web services transparently andautomatically

Brings the two worlds together

Allows more powerful operational modalities for both

A bridge through OWL(-S) to enable Semantic Web and Semantic Grid applications

W3C Web Services Architecture clearly expresses the notion that, “... software agents arethe running programs that drive Web services - both to implement them and to access themas computational resources that act on behalf of a person or organisation.”

Our solution is the introduction of a Web Service Integration Gateway (WSIG) designed toencapsulate all functionality required to connect the two realms, whilst ensuring minimalhuman intervention and service interruption

Page 4: JADE Tutorial WSIG Slides

Dominic Greenwood –4–Copyright © 2005 by Whitestein Technologies AG, SwitzerlandAll rights reserved.

FIPA Directory Facilitator for agent services

UDDI for Web services

Standard Register, Deregister, Modify and Search services are exposed

WSIG Architecture

The Basics

Standalone intemediary gateway service

Offers transparent, bi-directional transformations between FIPA compliant agents servicesand Web services employing the WSDL/SOAP/UDDI stack

JADE selected as platform to host agents

Intercepts calls from agents to Web services and Web service clients to agent services

Contains two internal registries:

Page 5: JADE Tutorial WSIG Slides

Dominic Greenwood –5–Copyright © 2005 by Whitestein Technologies AG, SwitzerlandAll rights reserved.

WSIG Architecture (cont.)

Requirements

JADE v3.3

Jakarta Tomcat (http://jakarta.apache.org/tomcat/)

Apache jUDDI (http://ws.apache.org/juddi/)

mySQL (http://www.mysql.com/)

MySQL Connector/J (http://www.mysql.com/products/connector/j/)

Apache Axis v1.1 (http://ws.apache.org/axis/)

UDDI4J v2.0.2 (http://www.uddi4j.org/)

WSDL4J v1.4 (http://www-124.ibm.com/developerworks/projects/wsdl4j/)

Xerces v2.6.2 (http://xml.apache.org/xerces-j/)

Page 6: JADE Tutorial WSIG Slides

Dominic Greenwood –6–Copyright © 2005 by Whitestein Technologies AG, SwitzerlandAll rights reserved.

WSIG Architecture (cont.)

Standard WSIG Architectural Model

Page 7: JADE Tutorial WSIG Slides

Dominic Greenwood –7–Copyright © 2005 by Whitestein Technologies AG, SwitzerlandAll rights reserved.

WSIG Architecture (cont.)

Abstract Components

The GatewayRegistry

Accepts external register, deregister, modify and search calls

… From JADE agents

… From external Web services

Receives and processes incoming directory operations, thereby controlling access to theinternal registries

ACL encoded service descriptions stored in the JADE Platform DF

WSDL encoded service descriptions stored in the internal UDDI

Automatic translation between these performed by ServiceDescriptionTranslator

Page 8: JADE Tutorial WSIG Slides

WSIG Architecture (cont.)

Dominic Greenwood –8–Copyright © 2005 by Whitestein Technologies AG, SwitzerlandAll rights reserved.

WS registers

SD with WSIGUDDI

WS authenticatedand tModel isregistered withWSIG UDDI

Translate

WSDL intoFIPA ACL/SL0

Send

registration to

Create FIPA

Actions performedby the WSIG

Gateway Agent

WSDL from

RegistrationActions performed

by the originatingWeb service

Actions performedby the JADE DF Return Done

DF registersSD

Agent sendsSD to DF

Store AgentSD in DF

into WSDL

No

JADE DF

Create stub forAgent service

on Axis Server

AS->WS?

RegistertModel+WSDL

in UDDI

Actions performedby the JADEPlatform DF

Extract

Return Done

UDDI

Actions performedby the originating

JADE agent

tModel

Send AgentSD to Gateway

Agent

Translate

Create

ACL/SL0

tModel for

Yes

Agent SDActions performed

by the WSIGGateway Agent

Return Done

Page 9: JADE Tutorial WSIG Slides

Dominic Greenwood –9–Copyright © 2005 by Whitestein Technologies AG, SwitzerlandAll rights reserved.

WSIG Architecture (cont.)

Abstract Components

ServiceDescriptionTranslation

•Translation of ACL Service Descriptions to WSDL and vice-versa

ACL

JOB

Page 10: JADE Tutorial WSIG Slides

Dominic Greenwood – 10 –Copyright © 2005 by Whitestein Technologies AG, SwitzerlandAll rights reserved.

WSIG Architecture (cont.)

Abstract Components

StubCreation

Creates method stubs for Web services to call agent services via the gateway

When a new agent service is registered with the WSIG, the Gateway Agent contacts Axisto expose a corresponding Web service stub

Stub is built from the WSDL service description of the agent service held in the WSIGUDDI

When an invocation is received from a Web service client stub is activated

Manages reception and processing of the incoming message

And any subsequent conversation context

•When an agent invokes a Web service, if a response is expected a temporary stub iscreated and removed once the reply is received

Page 11: JADE Tutorial WSIG Slides

Dominic Greenwood

WSIG Architecture (cont.)

Abstract Components

WebServiceInvocation

•Transforms an ACL request into a SOAPinvocation and any return value from aWeb service back into an ACL inform

Extract ACLEncoded SD

WSDL SD

NoIs SD in

DF?

Yes

ReturnCorrespondingWSDL SD inUDDI tModel

NO

Return Failure

Send SOAPMessage toReceiver(s)

ReceiveReturn Callfrom WebService

Build SOAPMessage with

Construct ACLFIPA Inform fromReceived SOAP

Message

Send ACLInform

Message toAgent Sender

Is ResponseExpected?

YES

Create TemporaryReturn Stub for

Send SOAPCopyright © 2005 by Whitestein Technologies AG, Switzerland Message toAll rights reserved. Web service

Web Service

RemoveTemporary

Return Stub for – 11 –Web Service

Agent looks up SD inPlatform DF

Agent builds FIPARequest and sends to

Gateway Agent

Receive ACL EncodedFIPA Request for a

Web ServiceInvocation

Actions performedby a JADE agent

Actions performedby a the WSIGGateway agent

Page 12: JADE Tutorial WSIG Slides

Dominic Greenwood – 12 –

Abstract Components

AgentServiceInvocation

Transforms a SOAP invocation ontoan Agent service stub into an ACLrequest and any response from anACL inform back into a SOAPencoded return value

Is SD inUDDI?

No

Yes

Build FIPARequest

Message withACL SD

Is ResponseExpected?

No

Return Failure

Send FIPARequest

Message toAgent(s)

Receive FIPAInform

Message from

Agent

Construct SOAPMessage fromReceived FIPA

Inform Message

Send SOAPResponse

Message to

invoking WebService Client

Yes

Request

Send FIPA

Copyright © 2005 by Whitestein Technologies AG, SwitzerlandAll rights reserved. Message to

Agent(s)

WSIG Architecture (cont.)

WS Client looks up SDin WSIG UDDI

WS Client buildsSOAP Request and

sends serviceendpoint on WSIG

Receive SOAPMessage Request for

an Agent ServiceInvocation

ExtractWSDL

Encoded SD

Actions performedby a WS Clientt

Actions performedby a the WSIGGateway agent

Page 13: JADE Tutorial WSIG Slides

Dominic Greenwood – 13 –Copyright © 2005 by Whitestein Technologies AG, SwitzerlandAll rights reserved.

•Semantic Integration Gateway uses OWL-S

Use of the OWL-S Grounding Ontology to mapstandard WSDL elements onto ontology elements

WSDL operations are mapped onto OWL-Satomic processes

WSDL message elements are mapped ontothe inputs and outputs of the atomic process

OWL-S class types of the inputs and outputs of an atomic process are mapped onto theWSDL extensible concept of abstract type

In the opposite direction the OWL-S WsdlGrounding class is used

Semantic Coupling

Semantic Web Services

WSDL is fundamentally limited in its ability to express semantic information about a servicethat could be used by an agent for intelligently manipulating it

Page 14: JADE Tutorial WSIG Slides

Dominic Greenwood – 14 –Copyright © 2005 by Whitestein Technologies AG, SwitzerlandAll rights reserved.

Semantic Coupling (cont.)

The Basics

OWL-S provides the means to describe servicesaccording to three aspects:

The service profile defines what the serviceexpects of its consumers and what it providesfor them

The service process model defines how theservice operates

The service grounding defines how the service is accessed for use

Provides intrinsic support for more complex and dynamic service populations

Determining the best service to do the job

Determining how to create service chains according to goal specification and planresolution

Improved resilience to failure by providing greater degrees of freedom to adapt

Page 15: JADE Tutorial WSIG Slides

Dominic Greenwood – 15 –Copyright © 2005 by Whitestein Technologies AG, SwitzerlandAll rights reserved.

Semantic Coupling (cont.)

WSIG OWL-S Architecture

Page 16: JADE Tutorial WSIG Slides

Dominic Greenwood – 16 –Copyright © 2005 by Whitestein Technologies AG, SwitzerlandAll rights reserved.

Semantic Coupling (cont.)

Registering an Agent Service

Page 17: JADE Tutorial WSIG Slides

Dominic Greenwood – 17 –Copyright © 2005 by Whitestein Technologies AG, SwitzerlandAll rights reserved.

More companies are adopting Business Rules and BPM

Need to synthesise and enact collaborating business processes

Transition of business semantics along the value-chain

Need to create an agile, collaborative service ecosystem

Need to pervade business semanticsthroughout the service infrastructure

Dynamic composition of Semantic Webservices is a viable solution for BPMcollaboration

WSIG is an example of one of the toolsrequired to realise this

Closing Remarks

Are Semantic Web Services a Commercial Viability?

Yes for many reasons, but here’s one:

Page 18: JADE Tutorial WSIG Slides

Dominic Greenwood – 18 –Copyright © 2005 by Whitestein Technologies AG, SwitzerlandAll rights reserved.

Invocation of dynamically composed A/W service populations

BPM process collaboration system with WSBPEL

We welcome interests in collaboration from the community

Ongoing & Future Work

Directions

Completion of JADE ontology bean publication as OWL-S ontologies

Extension to support WSDL-S and WSMO series

ME version planned for disconnected service with mobile devices

Version with OWL-S support will be released shortly within WSIG add-on of JADE

Sample application scenarios in development


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